Question about 1991 Chevrolet Suburban

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1991 chevy s10 pickup 4.3 engine

My 1991 s10 pickup failed the emissions 3 times.hydrocarbons are high and co is any ideas?

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  • Anonymous Mar 30, 2014

    does the 2003 s10 pickup have a high low wiper fuse



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Check for vac. leaks and timing.

Posted on Jul 13, 2008


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Failed emissions hc high

First I recommend changing spark plugs, air filter, and change the oil & filter. If these are dirty or fouled up it will kill your millage and help to fail smog.
You can reduce both NOX and CO emmissions by adding denatured alcohol to the gas tank. Run it down to a bit under 1/4 tank and add 1 1/2 gallons. It makes the engine run a bit rough, but really clean.
If you still fgail SMOG then you need a new catalytic converter.
I used to "trick" my 86' with alcohol, but just rebuilt the engine so I put a new Cat on it. It passed emissions with WELL BELLOW numbers.

Good luck.

Aug 08, 2014 | 1991 Toyota Pickup

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Mine want pass emissions high hydrocarbon runs slugish. sometimes wont start takes a couple of times to start could that be main relay

Many things can cause this, so I'll just try to hit the high spots.

1. Poor fuel ignition (bad plugs, wires, cap, rotor, etc.
2. Improper Ignition Timing
3. Lean air fuel ratio mixture
4. Defective Catalytic Convertor
5. Defective Air Injection System.
6. Low Compression

These are general things that can cause this condition, but they may not be applicable to your particular vehicle.

Try a good old fashioned tune up: Plugs, wires, cap, rotor and points (if applicable) and a new air filter.

Wouldn't be a bad idea to also change the oil and oil filter.

The final item (#6) is a sign of a well worn engine and if this proves to be the primary problem, I'm afraid a engine rebuild is in order.

Anyway, good luck!

Feb 01, 2011 | 1991 Honda Civic

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My 1985 Chevy k-10 pickup failed emissions in az at 4.46 on the h 6 on the hydrocarbons and 164.24 on the carbonmonoxide . The aplicable standards are 4.40 on the hcs and 48.0 on the co .what do I need to...

The problem with emissions is there are so many things that can help out a little or a lot, Have you had the car checked for any issues with the exhaust such as 02 sensors, converters, muffler, charcoal canister. Try using a higher octane gas that will burn better, this will create a leaner exhaust and also install plugs that will create a hotter spark to ignite the gas during combustion. Here in SC we don't have the emission laws and it's not used as freq. as other states. Good Luck. By the way. I work for Bosch which makes the 02 sensors and I suggest buying the aftermarket because these are built and made the same but the OEM is 2x's as high if not more.

Aug 16, 2010 | 1985 Chevrolet K1500

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Crossed up plug wires on 1991 chevy s10 2.8 need diagram

For the 1991 Chevrolet S10 or T10 Pickup 2.8L V6:

Firing Order:



Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at!

Apr 22, 2010 | 1991 Chevrolet S-10

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Need firing order diagram for 91 s10 blazer

991 Chevy S10 firing order
The firing order for a Chevy s10 depends on which engine you have.
1.9L engine the firing order is: 1-3-4-2 . Distributor rotates counterclockwise.
2.0L engine the firing order is: 1-3-4-2 . Distributor rotates clockwise.
2.5L engine the firing order is: 1-3-4-2 . Distributor rotates clockwise.
2.8L engine the firing order is: 1-2-3-4-5-6 . Distributor rotates clockwise.
4.3L engine the firing order is: 1-6-5-4-3-2 . Distributor rotates clockwise.

Jan 09, 2010 | 1991 Chevrolet S-10

1 Answer

Isuzu Hombre pickup, 2.2L Vortec, Won't Start.

You need four things for an engine to run. 1. fuel 2. spark 3. compression 4. timing (spark at the right time. By your post it seems you have fuel and spark and you probably have compression unless you blew a head gasket. That leaves the timing. Check the timing and/or the timing belt or chain whichever you have.

Jul 01, 2009 | 1998 Isuzu Hombre

1 Answer

1991 Nissan Pickup Fail Emission for Hydrocarbons

i know it sounds silly but the garunteed to pass stuff at the auto stores work.

Mar 05, 2009 | 1991 Nissan Pickup

1 Answer

1986 camaro emissions problem- 6 cylinder stick

high hydrocarbons indicates head gasket(1 or both) leaking , carbon monoxide is a worn out catylitic convertor which both could lead to the oxy sensor getting a false reading

Oct 28, 2008 | 1986 Chevrolet Camaro

1 Answer

My chevy s10 failed emissions

Have your cat. converter checked out. I just had one of these for the same reason in my shop today.

Jul 09, 2008 | 1991 Chevrolet S-10

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